The RPM Package Manager (RPM) is a powerful package management system  used by Red Hat Linux and its derivatives such as CentOS and Fedora.  RPM also refers to the rpm

In Linux, groups are used to organize and administer user accounts.  The primary purpose of groups is to define a set of privileges such as  reading, writing, or executing permission

whereis is a command-line utility that allows you to  find the location of the binary, source, and manual page files for a  given command. In this article, we will show

In Linux, each file is associated with an owner and a group and has  permissions that determine which users may read, write, or execute the  file. The chgrp command changes

Network File System (NFS) is a distributed file system protocol that  allows you to share remote directories over a network. With NFS, you can  mount remote directories on your system

By default, the system hostname is set during the installation  process, or if you are creating a virtual machine it is dynamically  assigned to the instance at startup, but there

There  are several different ways to remove directories in Linux systems. If  you use a Desktop file manager such as Gnome’s Files or KDE’s Dolphin,  then you can

When you type a command on the command line, you’re basically telling  the shell to run an executable file with the given name. In Linux these  executable programs like

One of the most common operations when working on Linux is to search  for files and directories. On Linux systems, there are several commands  which allow you to search for

Whether you are troubleshooting network connectivity issues or  configuring a firewall one of the first things to check is what ports  are actually opened on your system. This article describes

The kernel is the core component of an operating system. It manages  the system’s resources, and it is a bridge between your computer’s  hardware and software. There are

In Linux, a group is a collection of users. The main purpose of the  groups is to define a set of privileges like read, write, or execute  permission for a

On Linux and Unix operating systems, all new files are created with a default set of permissions. The umask utility allows you to view or to set the file mode

When working on the command line, quite often you will need to create  or edit text files. Two of the most powerful and popular command-line  editors are Vim and Emacs.

The sudo command allows trusted users to run programs as  another user, by default the root user. If you spend a lot of time on  the command line, sudo is

UFW stands for Uncomplicated Firewall, and is a user-friendly  frontend for managing iptables (netfilter) firewall rules. It is the  default firewall configuration tool for Ubuntu and is also available for

tr is a command-line utility in Linux and Unix systems  that translates, deletes, and squeezes characters from the standard  input and writes the result to the standard output. The tr

When administering MySQL  database servers, one of the most common tasks you’ll have to do is to  get familiar with the environment. This involves tasks such as listing  databases

How much free RAM memory do I have available on my Linux system? Is  there enough free memory to install and run new applications? In Linux systems, you can use

The source command reads and executes commands from the  file specified as its argument in the current shell environment. It is  useful to load functions, variables and configuration files into

The sudo command allows you to run programs as another user, by  default the root user. If you spend a lot of time on the command line,  sudo is one

Vim is the text editor of choice for many users that spend a lot of  time on the command line. Unlike other editors, Vim has several modes of  operation, which

The nohup command executes another program specified as its argument and ignores all SIGHUP (hangup) signals. SIGHUP is a signal that is sent to a process when its controlling terminal